Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill and Intangible Assets

Goodwill

The following table represents changes in the carrying amount of goodwill:

	December 31, 2019		Additions		Foreign currency exchange rate fluctuations		September 30, 2020
	(In thousands)
Goodwill	$	336,539	$	—	$	(83)	$	336,456

Intangible Assets, Net

The carrying amounts and useful lives of intangible assets as of September 30, 2020 and December 31, 2019 were as follows:

	September 30, 2020
	Gross carrying amount (1)		Accumulated amortization		Foreign currency exchange rate fluctuations		Net carrying amount		Useful life (years)
	(In thousands, except for years)
Customer relationships	$	134,889	$	(60,964)	$	(1,088)	$	72,837	10 - 30
Acquired technology	77,029		(42,008)		6		35,027		5 - 20
Backlog	1,150		(1,006)		—		144		4
Trade names	7,650		(5,603)		15		2,062		6 - 12
Patents	3,217		(1,701)		1		1,517		2 - 20
Total intangibles assets, net	$	223,935	$	(111,282)	$	(1,066)	$	111,587

	December 31, 2019
	Gross carrying amount (1)		Accumulated amortization		Foreign currency exchange rate fluctuations		Net carrying amount		Useful life (years)
	(In thousands, except for years)
Customer relationships	$	135,234	$	(54,860)	$	(1,058)	$	79,316	10 - 30
Acquired technology	77,142		(36,194)		5		40,953		3 - 20
Backlog	1,150		(791)		—		359		4
Trade names	7,650		(5,037)		11		2,624		6 - 12
Patents	3,217		(1,603)		1		1,615		2 - 20
Total intangibles assets, net	$	224,393	$	(98,485)	$	(1,041)	$	124,867

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(1)    The differences in gross carrying amounts between periods are primarily due to the write-off of certain fully amortized intangible assets.

Amortization expense of intangible assets was $4.4 million and $4.6 million for the three months ended September 30, 2020 and 2019, respectively, and $13.3 million and $14.1 million for the nine months ended September 30, 2020 and 2019, respectively.

The estimated future amortization expenses for amortizable intangible assets were as follows:

	September 30, 2020
	(In thousands)
Remaining three months of 2020	$	4,280
2021	16,109
2022	14,814
2023	13,718
2024	7,959
Thereafter	54,707
Total	$	111,587